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I-4 <br /> Geographically Associated Soils: These are the Haxtun and Valent and Vona soils. Haxtun soils <br /> have a mollic horizon thicker than Sl centimeters(20 inches). Osgood soils frequently form a topo <br /> sequence with the soils of the Valent series which lack an argillic horizon. Vona soils lack A <br /> horizons with texture coarser than loamy fine sand that are thicker than SI centimeters(20 inches). <br /> Drainage and Saturated Hydraulic Conductivity:Drainage:well drained. Runoff.-low. Saturated <br /> Hydraulic Conductivity: high to very high <br /> Use and Vegetation: These soils are used principally as native rangeland. Principal native <br /> vegetation is sand bluestem, sand sage, and blue grama. <br /> In general, the available soils (and more specifically, those of the predominant Osgood series) can be <br /> considered suitable growth medium in that they currently support vegetation and rangeland uses in their <br /> (relatively) undisturbed or pre-mining state. Given that pre-stripping of long-term operational areas will <br /> encompass the storage and stabilization of the existing growth medium(to a nominal depth of 12-inches) <br /> for eventual replacement at such time operations cease; and, that pre-stripping of annual mine blocks will <br /> be carried out with concurrent reclamation(i.e., replacement of the stripped existing growth medium atop <br /> the prior year's mined out area) during steady-state operations, virtually all re-placed (to a nominal 8- to <br /> 12-inch thickness) growth medium will be effectively the same as that currently overlying the target sand <br /> deposit. Thus,the material can be judged to be suitable for establishment and maintenance of plant growth. <br /> This will be further assured through the implementation of a five(5)year post-reclamation monitoring and <br /> maintenance period to be carried out by CSC. <br /> Keenesburg No. 2 Mine_112 Reclamation Operation—November 22, 2019 <br />